﻿using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

/// <summary>
///Export 的摘要说明
/// </summary>
public class Export
{
    public Export()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    public static void CreateExcel(DataSet ds, string FileName)
    {
        HttpResponse Response = HttpContext.Current.Response;
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        string colHeaders = "", ls_item = "";

        //定义表对象与行对象，同时用DataSet对其值进行初始化 
        DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
        int i = 0;
        int cl = dt.Columns.Count;


        //取得数据表各列标题，各标题之间以/t分割，最后一个列标题后加回车符 
        for (i = 0; i < cl; i++)
        {
            if (i == (cl - 1))//最后一列，加/n
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "\n";
            }
            else
            {
                colHeaders += dt.Columns[i].Caption.ToString() + "\t";
            }

        }
        Response.Write(colHeaders);
        //向HTTP输出流中写入取得的数据信息 

        //逐行处理数据   
        foreach (DataRow row in myRow)
        {
            //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据     
            for (i = 0; i < cl; i++)
            {
                if (i == (cl - 1))//最后一列，加/n
                {
                    ls_item += row[i].ToString() + "\n";
                }
                else
                {
                    ls_item += row[i].ToString() + "\t";
                }

            }
            Response.Write(ls_item);
            ls_item = "";

        }
    }

}
